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The MCQs below are drawn from the Physics subject category.
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131
In the SI system, the unit of temperature is
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Explanation
The SI base unit of thermodynamic temperature is the kelvin.
132
Unit of power is
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Explanation
Power is the rate of energy transfer; kilowatt (kW) is a unit of power (1 kW = 1000 W).
133
Which of the following is a unit of frequency?
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Explanation
Hertz (Hz) is the SI unit of frequency, representing cycles per second.
134
The mass of an object is a quantitative measure of its
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Explanation
Mass measures the amount of matter and quantifies inertia (resistance to acceleration), so inertia is the correct measure.
135
An iron needle slowly placed on the surface of water floats on it because
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Explanation
Surface tension of the water provides an upward force at the interface that supports the needle, so the needle floats due to surface tension.
136
Which of the following is SI base unit for temperature?
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Explanation
The Kelvin is the SI base unit for thermodynamic temperature.
137
Radian and Steradian are named as:
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Explanation
Historically radian and steradian were classified as supplementary units (dimensionless); they are not base units.
138
Candela is the SI base unit of
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Explanation
Candela is defined as the SI base unit of luminous intensity.
139
When two capillary tubes of different diameters are dipped vertically, the rise of the liquid is
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Explanation
Capillary rise is inversely proportional to tube radius, so the liquid rises more in the smaller-diameter tube.
140
One ounce is equal to how many grams?
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Explanation
One ounce is approximately 28.35 grams, so option D is correct.
